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An induction coil or is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current (DC) supply.To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Development began in 1836 by Nicholas Callan, Charles Page and others. The induction coil was the first type of transformer and they were widely used in x-ray machines,spark-gap radio transmitters,arc lighting and quack medical electrotherapy devices from the 1880s to the 1920s. Today their only common use is as the ignition coils in internal combustion engines and in physics education to demonstrate induction.
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